PPG-15 has a Natural Origin Index (NOI) of 0.00 (scale 0–1) per ISO 16128. Entire polypropylene glycol chain is built from petrochemical propylene oxide units; no natural feedstock is used. An NOI of 0.00 means 0% of its molecular mass is traceable to a natural, renewable source.

Is PPG-15 natural? NOI 0.00 — Is That Natural?

How we scored it

PPG-15 = chain of 15 mol propylene oxide (petrochemical). PubChem row shown is the PO monomer/propylene glycol (76 Da), not the polymer; description is authoritative.

What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Manufactured by polymerising petrochemical propylene oxide onto a starter alcohol to an average of 15 PO units. No natural-origin route exists for this polymer.

In plain English

A synthetic polymer built from 15 units of propylene oxide, used to condition skin and help other ingredients spread smoothly. It is a petrochemical polymer, not the small propylene-glycol molecule some databases show.

CosIng definition: Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-hydro-.omega.-hydroxy- (15 mol PO average molar ratio)

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References

1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
2PPG-15. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
3PPG-15. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=PPG-15